41
5784 568 - 13
Vitodens 100-W, B1HA/B1KA 26 to 125 Combi Installation/Service
Accessing
Electrical Connections
(continued)
Control Connections
Optional operating control - OpenTherm (OT)
What is OpenTherm (OT)?
The OpenTherm (OT) protocol is a point-to-point
communication system, which connects a boiler with a
room controller or other devices. The room temperature
feedback calculates a heating demand (water temperature
request) and transmits it to the boiler. The boiler will
adjust the heat input accordingly (low-high modulation).
Follow the installation instructions of the field supplied
operating controls.
Refer to the OpenTherm accessory manual and page 69 of
this manual for additional information.
Connecting the outdoor temperature sensor
Legend
A
Outdoor temperature sensor supplied
Legend
A
OpenTherm (OT) or OT input module 0-10VDC (accessory)
Connecting an OpenTherm (OT) device
A
Boiler control base
Factory
installed
terminal block
A
Boiler control base
Factory
installed
terminal block
*
Connection must be made on
terminals 1 and 2 for one of
the three options shown on
page
40.
*